EP0223087A1 - Isolierungsverfahren mittels Imprägnierung von elektrischen Leitern - Google Patents

Isolierungsverfahren mittels Imprägnierung von elektrischen Leitern Download PDF

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Publication number
EP0223087A1
EP0223087A1 EP86114527A EP86114527A EP0223087A1 EP 0223087 A1 EP0223087 A1 EP 0223087A1 EP 86114527 A EP86114527 A EP 86114527A EP 86114527 A EP86114527 A EP 86114527A EP 0223087 A1 EP0223087 A1 EP 0223087A1
Authority
EP
European Patent Office
Prior art keywords
tape
ribbon
varnish
groups
epoxy
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP86114527A
Other languages
English (en)
French (fr)
Other versions
EP0223087B1 (de
Inventor
Alain Anton
Alain Dubuisson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alstom Holdings SA
Original Assignee
Alstom SA
GEC Alsthom SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alstom SA, GEC Alsthom SA filed Critical Alstom SA
Priority to AT86114527T priority Critical patent/ATE53142T1/de
Publication of EP0223087A1 publication Critical patent/EP0223087A1/de
Application granted granted Critical
Publication of EP0223087B1 publication Critical patent/EP0223087B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/86—Incorporated in coherent impregnated reinforcing layers, e.g. by winding
    • B29C70/865—Incorporated in coherent impregnated reinforcing layers, e.g. by winding completely encapsulated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/02—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising combinations of reinforcements, e.g. non-specified reinforcements, fibrous reinforcing inserts and fillers, e.g. particulate fillers, incorporated in matrix material, forming one or more layers and with or without non-reinforced or non-filled layers
    • B29C70/021—Combinations of fibrous reinforcement and non-fibrous material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/30—Drying; Impregnating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
    • B29K2105/0809—Fabrics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
    • B29K2105/0854—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns in the form of a non-woven mat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2709/00—Use of inorganic materials not provided for in groups B29K2703/00 - B29K2707/00, for preformed parts, e.g. for inserts
    • B29K2709/10—Mica
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0003—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular electrical or magnetic properties, e.g. piezoelectric
    • B29K2995/0007—Insulating

Definitions

  • the present invention relates to a method of insulating by impregnating electrical conductors using isocyanurate and oxazolidone ring resins, in which a ribbon of fabric or glass felt, or plastic film, is wound around the conductors. porous mica paper, the ribbon is impregnated with a varnish comprising a polymerizable liquid resin, then the impregnated ribbon is subjected to a polymerization heat treatment.
  • the present invention aims to provide a very flexible and mechanically resistant tape insulation, having no brittleness, and easy to wrap around the conductors using a machine.
  • the method according to the invention is characterized in that the ribbon of a bonding powder is initially added between the fabric or glass felt, or plastic film, and the porous mica paper, this bonding powder being formed of a polymer with chains of oxazolidone groups containing epoxy end groups, and in that the liquid polymerizable resin of the varnish contains essentially isocyanates which will transform into isocyanurate groups during the polymerization.
  • the bonding powder is added to the tape in a proportion of approximately 20% by weight.
  • the bonding powder is added to the ribbon by the wet method, preferably in dissolution in methyl ethyl ketone.
  • the tape is free of non-stick interlayer.
  • the impregnation varnish is free of solvent.
  • the tape bonding powder is obtained by reacting an epoxy resin on an isocyanate in the presence of a condensation catalyst, then mixing the condensation product with an epoxy resin.
  • Adding to the mixture of the condensation product and an epoxy resin a reaction catalyst for the epoxy groups on the isocyanate groups.
  • the impregnating varnish based on isocyanate derivatives is added with a small amount of epoxy derivatives and a stabilizer.
  • the method of the invention makes it possible to form, within the insulating wall of the conductor, a resin with a controlled structure comprising on the one hand linear polymer blocks with oxazolidone sequences, mainly concentrated in the micaceous ribbon, on the other hand crosslinked polymer blocks with isocyanurate sequences, provided by the impregnation varnish, which will serve as nodes for the formation of a three-dimensional macromolecular network.
  • the fact of using a bonding powder consisting of an oxazolidone chained resin with epoxy end groups ensures very good bonding between the glass fabric or felt, or the plastic film, and the mica paper, due to the good wettability of mica by such a resin and of its strong adhesive power on glass, which is stored at high temperature, up to above 200 ° C.
  • the ribbon formed has very great flexibility, its binder being a polymer linear of thermoplastic nature. This flexibility greatly facilitates its installation on thin conductors.
  • the impregnating varnish is one-component, solvent-free. It is very stable at room temperature, where its viscosity is low enough to allow it to easily permeate the wrapped winding.
  • This varnish becomes very reactive around 150 ° C in the presence of the active sites of the ribbon polymer network. This promotes gelling of the impregnating resin and leads to low consumption of the impregnating varnish.
  • the epoxy functions present in the tape react quickly with the impregnation varnish by forming two types of heterocycles, including mainly isocyanurates which stiffen the resin, even in the absence of catalyst. It is even preferable that the varnish does not contain a catalyst.
  • the heterocycles thus formed provide a gain in thermal and mechanical resistance compared to the silicone insulators often used in similar applications.
  • the powder is obtained by reacting an epoxy liquid resin sold under the designation Epon 827 by SHELL CHEMICAL Co and toluene diisocyanate in the presence of benzyltrimethylammonium chloride in ethanol.
  • Epon 827 an epoxy liquid resin sold under the designation Epon 827 by SHELL CHEMICAL Co
  • toluene diisocyanate an epoxy liquid resin sold under the designation Epon 827 by SHELL CHEMICAL Co
  • toluene diisocyanate toluene diisocyanate
  • benzyltrimethylammonium chloride in ethanol.
  • This product is then mixed with unmodified epoxy resins and dissolved in methyl ethyl ketone to facilitate the manufacture of the ribbon, the proportions being - 30 parts of the polymer with chains of oxazolidone rings and epoxy endings.
  • EPON 827 - 150 parts of methyl ethyl ketone.
  • Oil breakdown tests gave a minimum dielectric strength of 39 kV, for an insulation thickness of less than 1 mm.
  • Example 1 The same ribbon is used as that described in part a) of Example 1.
  • the impregnation varnish consists solely of the polyisocyanate marketed under the designation OPA 235 by UP JOHN CHEMICAL Co.
  • a part of benzyl triethylammonium chloride can be added as a catalyst (without this being necessary).
  • a motorette produced under the same conditions as above has a minimum dielectric strength of 36 kV.
  • the structure of the tape is similar to that of Example 1, but its bonding resin is different.
  • a polymer with oxazolidone units containing epoxy end groups is first formed by reacting the cycloaliphatic epoxy resin sold by the company Ciba-Geigy under the designation CY-192 and toluene diisocyanate in the presence of benzyltrimethylammonium chloride in ethanol.
  • This product is mixed with a liquid epoxy resin and dissolved in methyl ethyl ketone for the production of the ribbon in the proportions - 105 parts of the above reaction product - 45 parts of CY-192 epoxy resin - 100 parts of methyl ethyl ketone.
  • a catalyst can be added to the ribbon, without this being necessary.
  • Example 2 The same varnish is used as in Example 1 and the impregnation, gelation and polymerization of the insulation are likewise carried out.
  • the minimum dielectric strength is 35 KV.
  • Example 1 The same mica paper and the same glass cloth are used as in Example 1.
  • the bonding powder is obtained by mixing the liquid cycloaliphatic epoxy resin sold by the company Ciba-Geigy under the designation CY-179 and the polyisocyanate OPA 235 already mentioned in Example 2, in the presence of lithium chloride in methanol.
  • This product is mixed with an epoxy resin and dissolved in methyl ethyl ketone.
  • Example 2 The same varnish is then used as in Example 1 and the impregnation, gelation and polymerization of the insulation are likewise carried out.
  • the minimum dielectric strength is 38 KV.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulating Bodies (AREA)
  • Organic Insulating Materials (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Patch Boards (AREA)
  • Communication Cables (AREA)
  • Insulated Conductors (AREA)
  • Inorganic Insulating Materials (AREA)
EP86114527A 1985-10-22 1986-10-21 Isolierungsverfahren mittels Imprägnierung von elektrischen Leitern Expired - Lifetime EP0223087B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86114527T ATE53142T1 (de) 1985-10-22 1986-10-21 Isolierungsverfahren mittels impraegnierung von elektrischen leitern.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8515667 1985-10-22
FR8515667A FR2588798B1 (fr) 1985-10-22 1985-10-22 Procede d'isolation par impregnation de conducteurs electriques

Publications (2)

Publication Number Publication Date
EP0223087A1 true EP0223087A1 (de) 1987-05-27
EP0223087B1 EP0223087B1 (de) 1990-05-23

Family

ID=9324091

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86114527A Expired - Lifetime EP0223087B1 (de) 1985-10-22 1986-10-21 Isolierungsverfahren mittels Imprägnierung von elektrischen Leitern

Country Status (8)

Country Link
US (1) US4748048A (de)
EP (1) EP0223087B1 (de)
AT (1) ATE53142T1 (de)
CA (1) CA1292412C (de)
DE (1) DE3671564D1 (de)
ES (1) ES2015521B3 (de)
FR (1) FR2588798B1 (de)
PT (1) PT83583B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103000311A (zh) * 2011-09-14 2013-03-27 吴江市神州机械有限公司 一种漆包机的后龙门架结构

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH672611A5 (de) * 1987-04-30 1989-12-15 Fischer Ag Georg
US5989702A (en) * 1994-08-15 1999-11-23 General Electric Canada Inc. Sandwich insulation for increased corona resistance
WO1998058745A1 (en) * 1997-06-20 1998-12-30 New York University Electrospraying solutions of substances for mass fabrication of chips and libraries
DE19836293B4 (de) * 1998-08-11 2012-04-05 Gustav Wilms Ohg Verwendung einer flachen Schicht aneinander haftender Holzpartikel zur Absorption und zur Abtötung von Bakterien

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2655367B1 (de) * 1976-12-03 1978-04-13 Siemens Ag Heisshaertende Reaktionsharzmischung zur Impraegnierung von Isolierungen elektrischer Geraete und zur Herstellung von Formstoffen mit oder ohne Einlagen
DE3121725A1 (de) * 1981-06-01 1982-12-23 Hitachi, Ltd., Tokyo Elektrisch isolierte wicklungen und ihre herstellung
FR2550373A1 (fr) * 1983-08-03 1985-02-08 Alsthom Atlantique Procede d'isolation par impregnation de conducteurs electriques

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2847395A (en) * 1955-06-13 1958-08-12 Minnesota Mining & Mfg Stable heat-curing epoxy resin compositions
CA996849A (en) * 1972-08-02 1976-09-14 General Electric Company Insulating material
DE3323153A1 (de) * 1983-06-27 1985-01-03 Siemens AG, 1000 Berlin und 8000 München Hitzehaertbare reaktionsharzmischungen
US4606785A (en) * 1984-11-15 1986-08-19 Westinghouse Electric Corp. Simplified method of making high strength resin bonded mica tape

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2655367B1 (de) * 1976-12-03 1978-04-13 Siemens Ag Heisshaertende Reaktionsharzmischung zur Impraegnierung von Isolierungen elektrischer Geraete und zur Herstellung von Formstoffen mit oder ohne Einlagen
DE3121725A1 (de) * 1981-06-01 1982-12-23 Hitachi, Ltd., Tokyo Elektrisch isolierte wicklungen und ihre herstellung
FR2550373A1 (fr) * 1983-08-03 1985-02-08 Alsthom Atlantique Procede d'isolation par impregnation de conducteurs electriques

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IEEE TRANSACTIONS ON ELECTRICAL INSULATION, vol. EI-13, no. 6, Décembre 1978, pages 436-443, IEEE, New York, US; S.ISOBE et al.: "Large capacity class-H resin molded transformer" *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103000311A (zh) * 2011-09-14 2013-03-27 吴江市神州机械有限公司 一种漆包机的后龙门架结构

Also Published As

Publication number Publication date
CA1292412C (fr) 1991-11-26
DE3671564D1 (de) 1990-06-28
PT83583A (pt) 1987-05-29
ATE53142T1 (de) 1990-06-15
EP0223087B1 (de) 1990-05-23
FR2588798B1 (fr) 1987-12-11
FR2588798A1 (fr) 1987-04-24
US4748048A (en) 1988-05-31
PT83583B (pt) 1994-09-30
ES2015521B3 (es) 1990-09-01

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